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Coldplay drummer Will Champion performs at the iHeartRadio Music Festival at the MGM Grand Garden Arena September 23, 2011 in Las Vegas, Nevada.Photo: Ethan Miller/Getty Images

…like Will Champion of Coldplay, who will apparently cameo on season three. The EW report is very tight-lipped about the particulars, but that is not a problem, since you will clearly be able to identify him the minute he appears onscreen. (He will be the guy drumming while Jon Snow sings "Fix You" to the white walkers.)